CALIFORNIA STALK-EYED CRUSTACEA. 227 



armed with numerous, short, closely set spiuules, which do not extend in 

 front of the posterior third of lateral margins. The inner rami of the 

 uropods are shorter than the sixth abdominal segment, somewhat widened 

 at the base where the auditory organ is situated, behind which the sides 

 are nearly parallel to the abruptly rounded tip; outer ramus narrow, about . 

 one-half longer than the inner one and abruptly rounded at the end. 



Several specimens caught at San Pedro, Calif., by 

 Dr. H. P. Johnson, December 29, 1895. Collection 

 University of California. 



Genus Siriella Dana. 



Carapace small, rostrate. Eyes normal. Antennal scale with the outer 

 margin naked and produced distally into a spine. Legs subequal, the 

 propodi entire or only two-jointed and furnished with a transverse row of 

 setffi on either side of the strong, sharp, falciform claw. Pleopods rudi- 

 mentary in the female, larger and biramoas in the male and often fur- 

 nished with two spirally twisted appendages at the base of the inner 

 ramus. Outer ramus of the uropods larger than the inner, having an 

 imperfect articulation near the tip, and the outer margin armed with 

 spines. Telsou elongated, the margins spinous and the apex entire. Audi- 

 tory organ well developed. 



The species of this genus are mostly pelagic and 

 many of them have a very wide range. 



Siriella pacifica, sp. nov. ^ 



Kostrum triangular, acute. Eyes large. Peduncle of the antennules 

 reaching nearly to the tip of the antennal scale, the first joint larger than 

 the next two and concave above; second joint wider than long and bear- 

 ing two large plumose setse at the distal end; third joint about twice as 

 long as wide, with a single, large plumose seta near the middle of the 

 inner margin and several similar setae at the tip; inner flagellum about 

 two-thirds the length of the outer. Antennal scale oblong, the straight 

 outer margin ending in a spine; distal margin rounded, produced beyond 

 the outer spine, and furnished, like the inner margin, with long plumose 

 setae. Upper lip subcordate and produced at the anterior end into a long 

 narrow spine. Propodi of the thoracic legs two-jointed with a transverse 

 row of setae at the distal end on either side of the base of the dactyl. 

 Dactyls claw-like, tapering to a sharp, curved tip, and having a transverse 

 or oblique row of setae at about the proximal third of their length. 



